Install a system Maintenance and Optimization program for your PC. Every time you operate your PC, such as installing/uninstalling a program , there will be changes to your system registry. the registry will become clogged with several hundred operation without any maintenance! A clogged registry results in slow computer that freezes and crashes frequently! If you want to speed up your computer, try to install maintenance program. I am personally using Glary Utilities Free. I think it's good enough. Maybe you can have a reference too on the product site: www.glaryutilities.com

I agree that you should definitely scan for malware, If your free of it. Clear your Windows cache files, this is your temporary file. It can grow up to a large volume and stop your computer from using RAM properly. In a sense slow it down by preventing it from using free space.Here is how:

Manage your startups. Your excess CPU usage is due to too many programs running in the background. You can cut these to barebones by alter your msconfig. Here is how:

1. Open your Start menu.2. Click Run3. In the command screen type "msconfig.exe"4. In the "system configuration utility",click either "service" or "startup" tab5. Uncheck all programs that your are no longer using.6. Click "OK"

Other great tip is increasing your virtual memory to simulate more RAM.

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